<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			.yuan1{
				border-radius: 50px;
				width: 10px;
				height: 10px;
				float: left;
				margin: 2px;
				background-color: black;
			}
			#red{
				background-color: red;
			}
		</style>
	</head>
	<body>
		<div class="yuan">
			<div class="yuan1"></div>
			<div class="yuan1"></div>
			<div class="yuan1"></div>
			<div class="yuan1" id="red"></div>
			<div class="yuan1"></div>
		</div>
	</body>
</html>
